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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '293734407a9a5b04930358df7f12ca30b02d0aca8314c08dd99793c181a230fd' 
  AND token = '4K79c2h2quANEeJX1ExDXmEPotiukq+xRSFdJeWHSQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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