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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd831e93a25e6f5ba9a952bd435963aafa8738554a062c1eb6caf2e13dcab7e' 
  AND token = 'ucbECgbpBv6RVOh97wrNtpcdgKts+uG9jAdNjuZJblo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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