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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e2aeb011c07f565416e82a978b560011f72768ce9551ef350bad38a431d0ab' 
  AND token = '/UA5ScaDGf0vBUpHnkDRzT5g0Uz+1jdnMhMe3ezbDVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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