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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d38ef6fecad295ed3aaba10ee257fe483e79acc973da58ad60b7c0b630c8a03' 
  AND token = 'YhErfC0cKlWBe0z2infXKSlgCf0tTH14YItVs9H60ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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