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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d60f97c1c87e4077263d4333fe76b7fc4a1a6cb8af80ff9521a47642861e3b' 
  AND token = 'fFv3qpQLNZzSvPJEMLDGLFa8/DUm4yN0XPcc6FfNH48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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