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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68fec76ea71ed5004520770af6ba5c1f2baf8099529e0963c79181cf4bdfe548' 
  AND token = 'NjnebHnNDpydIdIAs6aONbZ7EnLZ2u3eS3m6T/KQXKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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