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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c750720fdfd0b8458dab840969e5283cbdbb0a2df99f806076ca5eada5983a6c' 
  AND token = 'xFSdY4fEfMitvaLogjHVhq2UGEleIRn9JaVqKSJbLo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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