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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d593813647bb3f8ad26f31c991eaaaa8e629a568d90d7c65692c871e1bf4e9d' 
  AND token = 'Bph+Ve8ZEeMUrZk0owUqrS8a4W2PH0hQuP6i3UNV14o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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