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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc3fde19de3076b8158a40920751321d05ceba1462ae8968972e173d2063e90' 
  AND token = 'ipSuC1h3FNfbiYLlabwmS+wXfErYCcroH64lR7q3/pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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