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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88705ec8f1f9760bc79f3f14f3009d265a82df5ba244cf8f04d6a4163f25e70f' 
  AND token = 'EH6QwNw74uAoKcLJzMVD4wJcjr0hMogOsb5CL1lKrdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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