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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978633e7fece50440571ed3ad6b93d9b6f753587c7fc41ce10ebc9aee223ae94' 
  AND token = '6HCTPantGN1vYEMzCWjZhztTv6FV8PL/bx/c6Pi6fJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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