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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '954ae3ee6ede4986fbab90367b04ad5b97b5952cd9c06e5c73a10780519a13f1' 
  AND token = '81NT1vIk4KfCVb06YHNnq5LpsTiihm73DKOIdGV2Ce4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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