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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9202d1553f999254e42be0b55ad3fed4cb013c5977e011dd514329eb6230f56a' 
  AND token = 'Tna5F7HR+B7RURCAI/vHuF78n/kcGxQ6kc6tQCnp0Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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