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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2b70ab0286575ec1353e9176012f4f576628287ab87711045b63836cae2413' 
  AND token = '0uyoRB1fEcGT7GRy2AlcrMdjrpeuiQn8i5wf7IkXSPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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