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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3a6b1039db90fa3779afc45b598a3272e7c5ce22bc60e1d224ec4dc03410b0' 
  AND token = '5Lw5lrONWfq/Cw7Uf70MbZKKTF4wYCV9qmVV4ORy7Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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