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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca3398c35b3e4f42498d96a882e18b55bc9bceea1a854246a8489e18ac44ce4' 
  AND token = '0S/puLkdp+zYq9saSEh7u5SQWCX4twrXBmARFMlU64g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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