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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d2f54cb82eeb7b711f6c0b86a2ae1f341b5b5ae1c5faab3a8a14064b122f8f2' 
  AND token = 'XVUu8Fqn7hMFTF7tfqjeGGo4r3ew22qPFCHHFliNNCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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