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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58ccebc82f206320ec9dcd25ec4bfcf47373a3a1fe13287125036106a4b12f9' 
  AND token = 'n+CCK0oLnCHJoA4k185BkdiTKO6YzO76hwKtPgJ9CSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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