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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f42a37c3e3c108359f1aa6663416426cd67c3ed76fe167b7528db14c02cad3' 
  AND token = 'rzfKTM6Ms/j7hCD1KAkucxCWNhsavCDrhNJFOTqElWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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