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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0103e727e26a1d2cc8fc51f6313ba75e50b8a8e4d5e9cabd35ac226eb5315d8' 
  AND token = 'x97M1EGc3UU44sYs/AMpSML1MNgO4fdyQ+8BD4BqbbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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