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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d37faf98538a1e27443934da25e1b5a0cf9241327bd76e27a69be4db391749' 
  AND token = '6qj5A8oUlMKhPbbSFWWlGve3g+0Z2UVlepm7RXd6G7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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