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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084f685c9ed7d1916d14376c39da1630f44a2d561908272f0bdd33f64d0d9274' 
  AND token = 'IzXG80gDsxEgKn12myHq17JDo8EDgExsYGfC8jEDj5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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