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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dd7890920884205d4bd080e6f8494bcdf41e0e755836866a0e977789a180ea' 
  AND token = '4QDGXNbA6Jkz4RhI+0CK3ncWBI1a5jFJx61mIrUP2SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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