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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b2d090369bebc453eeb3defcbce41332f623babaab6da8ecb5840f0ea892af' 
  AND token = 'zG2sdrAKC4xM35oFeEm66oetkvmYOKYts1iqJfpAd2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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