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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b185029b9df6f1e9c4f9438f8ce62fff651c79052f5b6155e01af35762b228cc' 
  AND token = '2ppNY6i48UbpBPtZLWGj6LlPTedQQRJKRbhlr1aNy/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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