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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7a8c42f70b9a4ccb10f883b7ec6b9c6099ca7c28c5da46037f0497bfa428c7' 
  AND token = 'dd61YPfxAwvv1aayYNFtpgCj+PnCKC5O1y3pb9cOOf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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