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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5982d1f122ac0d8d3d39cca9d9b2f22891221d24ee75b9e253c0ed64fb911ac7' 
  AND token = 'eTVVxAGxLGIYhXYTSOWCDzCDglho+FRME1y6qH3POsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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