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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138226bdf0c8ca8eafe45cdf1f4023fcd657726f7bbf960f5733017686639251' 
  AND token = 'Tx3p0z+I8cRSWNACIu37Z19GFXuB8NoWfPk3Uq4CCUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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