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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c871c1ac37c2e6e20680a3b85d367d27d6b3bb9616f16ecea9e86093b9ffdf' 
  AND token = '7OnTDbo+ohjfmMezJkPd19qqhPWLadKqzWIb6CMrc8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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