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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd6ba00df5dd4fe164a5dbf2b0c53744b67161958719833b87fa4cc0d0a9bd5' 
  AND token = 'i1/GSz2c6D14MfezujgR+RMtukpnas3U4mJ16KjnlsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}