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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101ba5ec2ba6ea831920dc258f12198d4914d9848f8fc374dd7df59e09a2991f' 
  AND token = 'pHAMrBtDawv3MWEFj2TW43JNGVH/Q0Ct3X/yTScUjJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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