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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149aed7735e474036386547448cf5af31d97c535bcb1d2da74d8aa6d6754c70d' 
  AND token = 'AJBLi7TtMogTKkFgkkulM4EaZ0htQ62NI/HewfQbUjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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