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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88656216a22a8722748dcca9ab78d1a537ac22a41c1907bfc549d47efc1575ae' 
  AND token = 'R9JRXwnU0olPNVH1mmYzwS1zAHT8no2jjq0SXU3L9DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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