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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f56039a8a0c94e7b80c78c3e9e27470fd715c84220a17798ef4a8b5d913006d' 
  AND token = '2M4O4UqCWPeCTVhQC67Zlo6zStsOMYSFlvUdv508NZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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