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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cf00b6469b373dc6d7b9a7377ac11916d76e3e5210e6dff6ec71c08f76510b' 
  AND token = '12W/GDJOwVCKAnWwqE5w5B5/uRJnWTRj01ijat1hzTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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