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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '361e7fd03ef24960aa68fb61962c1ff33f995a6fd0c15bd470d4e90d5461330b' 
  AND token = 'drdpr5MwrPPivkjPplyv2McwxB0dR+UnVCczywWQH18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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