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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a32ccfa0d175b78b317d2e23680e2fe5c260a982dfea6f242cdaa1b6426bd4' 
  AND token = 'WGk9JtyX+XvU43KHqCUCdmSdI8eeEN9FfKfU7DXy+I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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