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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b796e5d8cc1e2423431ad15b3ebd3ccad16d5b9f495050916abf23dd820ca43f' 
  AND token = 'wSz1a5jIruCiJCUuC6FCAODRzpH7GzWas/JnfYNKhs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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