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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c1ca7d253ea8c8e86ae2225c778474dabe4c0882efacc878bc6bb391af9d1b' 
  AND token = 'm9xOZx0Hj/a7yUECgWDDq7/oP2/A7D5NayP37RC6E7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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