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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751a5c4483f6511527e5a2a11217dda44e0e83dc68f17275c86b9fc2fd36f542' 
  AND token = 'KW67Z9bMkRQOgTOwESBRihnz3b5Wlqw9amJ0f254QGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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