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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951e4078e8ce5a5b58bd7295cd4ae52dffe52843b0f5f27088de894d150baaf4' 
  AND token = 'AzI5a6U599IVAxMMayOvUdGkFTJAuNpBP+3PptQT0Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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