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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcce3e899562ca3d6e5af9d898b80c96b960118a4405bb5ecf3add567671ed46' 
  AND token = 'uhbsdjWeUP4pU1t25sx7FSGT1aXC9zUM+o1TlEAocXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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