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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d067a21ce25e6bbc6ce33626559548267ec82426f8a91b15937ddab5a3c632' 
  AND token = 'G31INNmv6hMgx9uot9n0145H+E1R5hwe5cWsnplfqt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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