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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdfac719d4273a981ae7c585c188a3d1687dfd17d89af475b7190eb982f3b7ee' 
  AND token = 'EqlugCn0hhfGgUL6p9RcAqVeIJ/ZwX8WfCIIRBXV67o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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