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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac7c4884f1dd3bb79740709dd0d14565ae67e483855aab0f1fe0e84f1e19c52' 
  AND token = '3P0BM7lhcNVrgC4+ln3D8g4W+QHCbL62EMfiS1NrZSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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