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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83838e8d78e8e7bbf43663e021d1e16cc62bcc31908d215e000d638a9bf29be' 
  AND token = 'xhP7VL4rqo2eDuHyrxLWJBCDA20ihbGQuGej6W3sJDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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