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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ee8ca252a67929d31cfb1d7e04502c7ebd07a51f52f59217537e4c50f3351a' 
  AND token = 'DUjh4lgTxyb6tC0VnsOWfsW4RIcsXuergLX2nNFTTpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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