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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e76c78da57ec8cf2e5fdb662308bf1e89b3c1b3db8e0384e09e93fe48f7b4c2' 
  AND token = 'G+gMxoDPOW8nz+fJ+VLrdRZXCfRj3Xl9ODOaoTX0tmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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