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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fe012d707287f74dc05200150134afc8846ad8306be622e661b9581799eab5' 
  AND token = '3+vhE5utf8hePlLtJ1ZYNYZSe9eL6X3CAgFEI9dbOG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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