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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be78c71fd85a9445c4454bc4dbf3c013552009bebdddd2a6831dc9392db9b3f8' 
  AND token = 'ZwF4kRTtN+UAzfewRAWv5yeXziLmsPL/KYmnGpKKe9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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