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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860c4edc9819365ad65bbff65ea7514c6823c9e1e7558042349901ac09308aa2' 
  AND token = 'e1k6+pX6ZdRoOuSOR18AanXdx9Ukw9rWQiuxVC9totQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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