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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95590df75ca3bb8c3c0aba06b7e2f8e248d927c0bc311d5b0c98d1a360f6cf6' 
  AND token = 'ND++k6DrLpPCa/86EyV2tKcIh6jBJPK5ZjYM8Wh8K1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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