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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9972eaae4465de48f52f1bf7b10d2ded063af418b9e6545c66a12460c35d1a3' 
  AND token = 'luoE2CxTiTW74qi0XWHTw2AswoVMHemflSSC11Gx69E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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