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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9003483032870e9d7b0783672f770180e0e36963f31e3b01947cd27c614cd717' 
  AND token = 'BjbGL8rdYWvR+isrXKGMRRcriBq2zMoQ3zRG5+nmW1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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