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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c6a7964926bf776a0979b3a428fb8007a9e7ab9fc49bf738769b544d33f6dc' 
  AND token = 'E1drh5RzzQC0BBiAeyqwAzpLJRHlqGyHVapSC5zWH7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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