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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f9bf802e2cd25e0d7de60084df0582ae2c93f3b3dec1bb4809869c289bebe9' 
  AND token = '07pHWGweLuOJOS9tnTOc9+mfZEMsV18wPc70GAuotng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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