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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31082551a7364481ea34199ca5b0feb2e29416a6a29ebdb1165b4612423ec89c' 
  AND token = 'tgOAHVnEXUV4+51dARonFmHFvykJFWtIcQD4qIfeq/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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